Frequently Asked Questions

Yes, most likely you do. The United States and some countries use the 110V-120V voltage standard, while over 190 countries and regions worldwide (such as Europe, Asia, and Australia) use 220V-240V voltage.

If you plug American appliances that only support 110V (such as most hair dryers, curling irons, electric toothbrushes, etc.) directly into a 220V outlet, the internal components will immediately burn out due to excessive voltage, which may even cause safety hazards.

This is a crucial question, and confusing them may damage your devices.

Voltage Converter: Its core function is to change the voltage, for example, reducing the destination country's 220V high voltage to the U.S. standard 110V. This is designed for appliances that only support 110V (Single Voltage a.k.a. 110V Only).

Plug Adapter: It does NOT change the voltage, but only changes the physical shape of the plug to match different countries' wall outlet styles. It is suitable for "dual voltage" (Dual Voltage) devices that support 100V-240V, such as most phone chargers, laptops, CPAP machines, etc.

DOACE Solution: Most of our products, such as HC-X11 and LC-X35, cleverly combine both functions, providing both converter outlets and adapter outlets, one device to meet all your needs.

Yes, but only specific models. This is a key technical advantage. U.S. electrical standard is 60Hz, while many regions worldwide use 50Hz.

Can Convert: Our LC-X35, LC-X30, and LC-C30 models feature advanced AI chips that actively convert the input power's 50/60Hz frequency to a stable 60Hz output, crucial for frequency-sensitive precision appliances.

Cannot Convert: Other models, especially high-power 2000W models like HC-C11/HC-X11, do NOT have frequency conversion capability.

This is a technical principle issue. Our 2000W high-power converters (HC-C11/X11) use SCR (Silicon Controlled Rectifier) technology to efficiently step down voltage for high current.

How it works: SCR "chops" the sine wave current into segments through rapid switching to reduce average voltage.

• Mechanical Switch Devices (Compatible): Traditional hair dryers with pure mechanical switches (Conair/Revlon) work fine as heating elements continue working despite momentary interruptions.
• Electronic/Non-Mechanical Switch Devices (Incompatible): Dyson or devices with electronic chips, touch screens detect incomplete waveforms as faults, causing shutdown or failure to start.

In our product line, only the LC-X35 model has built-in surge protection. Surge protection protects your devices from high-voltage spikes when the power grid is unstable.

Choose based on your core devices:

• High-power heating devices (> 800W): Only choice - HC-C11 (2000W) or HC-X11 (2200W) for 110V-only mechanical switch styling tools.
• CPAP machines, nebulizers: Only recommended - LC-X35 (500W), LC-X80 (800W) with 100% pure sine wave and frequency conversion.
• Curling irons, compact devices: Best - LC-X35, LC-X30, LC-C30 (300-500W), stable support for hair styling tools.
• Laptops, cameras, shavers: First choice - LC-X30 (350W) for ultimate portability with frequency conversion.

• Performance & Power: LC-X35 (500W max, surge protection) vs LC-X30 (350W max)
• Portability: LC-X30 is 20% smaller and 30% lighter than X35
• Operation: LC-X30 has physical toggle switch, LC-X35 uses touch switch (long press)

Yes, but choose appropriate models. Most cruise companies prohibit surge protection devices.

• Recommended: LC-X30, LC-C30, HC-C11, HC-X11 (no surge protection)
• Not Recommended: LC-X35 (has built-in surge protection)

• Thin plug on cord: Standard Europlug for France, Italy, Spain, etc.
• Thick plug in box: Schuko plug for Germany, Austria, Netherlands, Sweden - for recessed outlets with better grounding.

Simply: Use Europlug by default; switch to thick Schuko adapter if outlet is recessed or connection unstable.

Follow these troubleshooting steps (90% of issues are resolved):

• Check Switch: LC-X35 uses touch switch requiring 2-3 second long press to turn on/off. LC-X30 has physical side switch.
• Confirm Power: Ensure converter is firmly plugged into powered wall outlet.
• Check Device: Ensure connected appliance is 110V. Plugging 220V-240V appliances into converter output won't work.

This is overload protection activating - connected appliances exceed power capacity. Immediately unplug all devices, wait a few minutes for reset, then reconnect lower-power devices.

• Processing Time: 3-5 business days after payment confirmation
• Shipping Time: 3-5 business days within U.S.
• Total Time: Processing + Shipping
• Weekend Orders: May delay, processed next business day

We ship from U.S. warehouses to U.S. addresses. Currently NOT shipping to Hawaii, Puerto Rico, or Guam.

• Website Orders: Track at doace.com/apps/ordertracking
• Amazon Orders: Provide Amazon order number for inquiry
• Tracking Email: Sent after shipping (may take 48-72 hours to update)
• Issues: Contact team@doace.com

Yes, if payment is complete but not yet shipped, contact us for full refund. Once shipped, order cannot be canceled.

30-day return policy - must be unused, with tags, in original packaging.

• Customer Reason: Customer pays return shipping
• Our Fault (damaged/wrong item): We pay return shipping

Contact spdoace@hotmail.com to start return process. We'll send return label and instructions. Do not return without contacting us first.

For fastest exchange: Return current item, then reorder desired item after return accepted.

All DOACE products include one year free warranty from purchase date. Contact customer service to purchase extended warranty.

Covers: Material/workmanship defects under normal use, non-human component failures.

Excludes: Accident/misuse damage, unauthorized modifications, force majeure (fire/flood), normal wear and tear.

Contact us via website chat or team@doace.com. Provide order number, fault description video, and connected devices.

We'll repair/replace defective parts free during warranty. If unrepairable, we'll replace with new device. DOACE pays return shipping.

Register immediately after purchase for priority processing on warranty claims, ensuring faster resolution.

These devices have motors or high-efficiency heating elements. Their startup peak power can be 3-7x their rated power. A 100W juicer may need >400W at startup, triggering overload protection on low-power models. Not recommended with portable travel converters.

Usually wrong model selection:

• LC-X30/X35 (350W/500W max): Only for some low-power styling tools. High-power dryers (1800W+) cause immediate overload.
• HC-C11/X11 (2000W+): For mechanical switch traditional dryers/straighteners only. NEVER use with electronic screen/touch/non-mechanical switch devices (like Dyson) - may damage device.

This is about LC-X35 power rating:

• 350W = continuous stable output: For most electronics (laptops, game consoles)
• 500W = peak or specific device power: Optimized for resistive heating tools (curling irons, straighteners) with stable 500W capacity

We recommend using 350W as main reference when selecting devices for best compatibility.

While individual devices may be within LC-X35's range, total power adds up. Xbox ~150-200W + small TV ~50-80W may exceed 350W continuous output limit, triggering overload protection.

We've noted some feedback in this range. May relate to device peak power. Some devices working in this range have internal components (compressors/motors) with periodic startups generating current spikes exceeding converter capacity. If you experience this, please record device brand/model and contact us for analysis.

For CPAP machines and precision medical devices, we only and strongly recommend LC-X35 for its 100% pure sine wave. Using other non-pure sine wave models (like LC-X30) or any modified square wave converters may damage precision circuits due to waveform mismatch.

Usually not a fault. Our LC-X35 uses touch switch requiring 2-3 second long press to turn on/off, not single click. Many first-time users unfamiliar with this. If still no response after long press, check power connection and contact us.

This is overload protection or self-diagnostics:

• Frequent restarts: Connected device power too high/unstable, protection repeatedly activating. Unplug and check device power.
• Startup light flashing: Device performing self-check, brief flashing is normal. If continuous flashing without working, disconnect all devices and power cycle.

DOACE converters are designed to step down from 220V-240V to 110V in those countries. Do NOT use in U.S. or any 110V region. Under wrong usage scenario, internal logic and thermal control malfunction, potentially causing overheating without fan activation - safety hazard.

No. Our converters are step-down units with fixed 110V-120V output, designed for U.S. appliances. Plugging 240V devices results in insufficient voltage causing non-operation or abnormal operation.

Follow troubleshooting steps:

1. Confirm main unit is on: Ensure converter is powered on (especially long-press or toggle switch models)
2. Check cables and devices: Try different USB cable or charge another device to rule out cable/device issues
3. Cruise ship environment: Some users report USB may not work on cruise ships, possibly related to special cruise power systems

IMMEDIATELY STOP USE AND DISCONNECT ALL POWER! Your safety is priority. Though extremely rare, this usually results from severe misuse:

• Connected prohibited devices: Steamers, irons, coffee makers with massive instantaneous power destroying internal components
• Severe short circuit: Connected device or cable has short circuit issue
• Liquid ingress or physical damage

Our products have multiple protections, will blow fuse when detecting fatal issues to prevent worse accidents. Contact us immediately and inform which appliances were connected for analysis and after-sales service.

Built-in fan is a critical component for safe heat dissipation during high-power conversion. When using high-power devices or extended operation, fan activates to expel internal heat, preventing overheating. This sound is a sign of normal operation, indicating the cooling system is protecting your safety.

Weight: Power conversion requires solid internal components like transformer coils and heat sinks. Some weight is necessary for safe, stable high-power output. We've optimized weight while ensuring performance.

Stability: Due to weight, we recommend connecting converter to well-maintained, tight-fitting wall outlets or use with desktop power strips for best stability.

We sincerely apologize. This is likely an issue with Amazon FBA warehousing or delivery. Please take photos immediately and contact us or Amazon customer service with your order number. We'll arrange replacement or refund right away.